Region
United States
606
Alaska
31
California
25
Nevada
21
Colorado
19
Florida
15
New Mexico
14
West (U.S.)
13
Washington (State)
12
Hawaii
11
Massachusetts
11
Mexico, Gulf of
10
Michigan
9
Wisconsin
9
Oregon
8
South Carolina
8
Sun
8
Louisiana
7
Outer space
7
Idaho
6
Massachusetts Bay
6
Montana
6
North America
6
Puerto Rico
6
Russia (Federation)
6
Texas
6
Utah
6
Afghanistan
5
Atlantic Coast (U.S.)
5
Middle West
5
National Petroleum Reserve
5
National Petroleum Reserve (Alaska)
5
Oklahoma
5
Earth (Planet)
4
East Asia
4
Georgia
4
Menominee County (Wis.)
4
Menominee Indian Reservation (Wis.)
4
Minnesota
4
Moon
4
New England
4
New York (State)
4
North Carolina
4
Ohio
4
Powder River Basin (Wyo. and Mont.)
4
Sacramento Metropolitan Area (Calif.)
4
Stellwagen Bank National Marine Sanctuary (Mass.)
4
Virginia
4
Wyoming
4
Arizona
3
more ...